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Annotation of src/sys/netinet/ip_input.c, Revision 1.379

1.379   ! maxv        1: /*     $NetBSD: ip_input.c,v 1.378 2018/04/11 07:55:19 maxv Exp $      */
1.89      itojun      2:
                      3: /*
                      4:  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
                      5:  * All rights reserved.
1.152     itojun      6:  *
1.89      itojun      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the project nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
1.152     itojun     18:  *
1.89      itojun     19:  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
1.76      thorpej    31:
1.365     maxv       32: /*
1.76      thorpej    33:  * Copyright (c) 1998 The NetBSD Foundation, Inc.
                     34:  * All rights reserved.
                     35:  *
                     36:  * This code is derived from software contributed to The NetBSD Foundation
                     37:  * by Public Access Networks Corporation ("Panix").  It was developed under
                     38:  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
                     39:  *
                     40:  * Redistribution and use in source and binary forms, with or without
                     41:  * modification, are permitted provided that the following conditions
                     42:  * are met:
                     43:  * 1. Redistributions of source code must retain the above copyright
                     44:  *    notice, this list of conditions and the following disclaimer.
                     45:  * 2. Redistributions in binary form must reproduce the above copyright
                     46:  *    notice, this list of conditions and the following disclaimer in the
                     47:  *    documentation and/or other materials provided with the distribution.
                     48:  *
                     49:  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
                     50:  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
                     51:  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
                     52:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
                     53:  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
                     54:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
                     55:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
                     56:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
                     57:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
                     58:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
                     59:  * POSSIBILITY OF SUCH DAMAGE.
                     60:  */
1.14      cgd        61:
1.1       cgd        62: /*
1.13      mycroft    63:  * Copyright (c) 1982, 1986, 1988, 1993
                     64:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd        65:  *
                     66:  * Redistribution and use in source and binary forms, with or without
                     67:  * modification, are permitted provided that the following conditions
                     68:  * are met:
                     69:  * 1. Redistributions of source code must retain the above copyright
                     70:  *    notice, this list of conditions and the following disclaimer.
                     71:  * 2. Redistributions in binary form must reproduce the above copyright
                     72:  *    notice, this list of conditions and the following disclaimer in the
                     73:  *    documentation and/or other materials provided with the distribution.
1.172     agc        74:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        75:  *    may be used to endorse or promote products derived from this software
                     76:  *    without specific prior written permission.
                     77:  *
                     78:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     79:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     80:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     81:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     82:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     83:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     84:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     85:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     86:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     87:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     88:  * SUCH DAMAGE.
                     89:  *
1.14      cgd        90:  *     @(#)ip_input.c  8.2 (Berkeley) 1/4/94
1.1       cgd        91:  */
1.141     lukem      92:
                     93: #include <sys/cdefs.h>
1.379   ! maxv       94: __KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.378 2018/04/11 07:55:19 maxv Exp $");
1.55      scottr     95:
1.324     pooka      96: #ifdef _KERNEL_OPT
1.184     jonathan   97: #include "opt_inet.h"
1.62      matt       98: #include "opt_gateway.h"
1.91      thorpej    99: #include "opt_ipsec.h"
1.55      scottr    100: #include "opt_mrouting.h"
1.167     martin    101: #include "opt_mbuftrace.h"
1.135     thorpej   102: #include "opt_inet_csum.h"
1.344     ozaki-r   103: #include "opt_net_mpsafe.h"
1.324     pooka     104: #endif
1.1       cgd       105:
1.325     roy       106: #include "arp.h"
                    107:
1.5       mycroft   108: #include <sys/param.h>
                    109: #include <sys/systm.h>
1.318     rmind     110: #include <sys/cpu.h>
1.5       mycroft   111: #include <sys/mbuf.h>
                    112: #include <sys/domain.h>
                    113: #include <sys/protosw.h>
                    114: #include <sys/socket.h>
1.44      thorpej   115: #include <sys/socketvar.h>
1.5       mycroft   116: #include <sys/errno.h>
                    117: #include <sys/time.h>
                    118: #include <sys/kernel.h>
1.72      thorpej   119: #include <sys/pool.h>
1.28      christos  120: #include <sys/sysctl.h>
1.230     elad      121: #include <sys/kauth.h>
1.1       cgd       122:
1.5       mycroft   123: #include <net/if.h>
1.44      thorpej   124: #include <net/if_dl.h>
1.5       mycroft   125: #include <net/route.h>
1.318     rmind     126: #include <net/pktqueue.h>
1.45      mrg       127: #include <net/pfil.h>
1.1       cgd       128:
1.5       mycroft   129: #include <netinet/in.h>
                    130: #include <netinet/in_systm.h>
                    131: #include <netinet/ip.h>
                    132: #include <netinet/in_pcb.h>
1.215     yamt      133: #include <netinet/in_proto.h>
1.5       mycroft   134: #include <netinet/in_var.h>
                    135: #include <netinet/ip_var.h>
1.266     thorpej   136: #include <netinet/ip_private.h>
1.5       mycroft   137: #include <netinet/ip_icmp.h>
1.89      itojun    138: /* just for gif_ttl */
                    139: #include <netinet/in_gif.h>
                    140: #include "gif.h"
1.144     martin    141: #include <net/if_gre.h>
                    142: #include "gre.h"
1.111     jdolecek  143:
                    144: #ifdef MROUTING
                    145: #include <netinet/ip_mroute.h>
                    146: #endif
1.302     christos  147: #include <netinet/portalgo.h>
1.89      itojun    148:
1.304     christos  149: #ifdef IPSEC
1.173     jonathan  150: #include <netipsec/ipsec.h>
1.305     rmind     151: #endif
1.44      thorpej   152:
1.1       cgd       153: #ifndef        IPFORWARDING
                    154: #ifdef GATEWAY
                    155: #define        IPFORWARDING    1       /* forward IP packets not for us */
1.370     maxv      156: #else
1.1       cgd       157: #define        IPFORWARDING    0       /* don't forward IP packets not for us */
1.370     maxv      158: #endif
                    159: #endif
                    160:
1.61      kml       161: #define IPMTUDISCTIMEOUT (10 * 60)     /* as per RFC 1191 */
1.53      kml       162:
1.370     maxv      163: int ipforwarding = IPFORWARDING;
1.372     maxv      164: int ipsendredirects = 1;
1.370     maxv      165: int ip_defttl = IPDEFTTL;
                    166: int ip_forwsrcrt = 0;
1.371     maxv      167: int ip_directedbcast = 0;
1.370     maxv      168: int ip_allowsrcrt = 0;
                    169: int ip_mtudisc = 1;
                    170: int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
                    171: int ip_do_randomid = 0;
1.184     jonathan  172:
1.165     christos  173: /*
                    174:  * XXX - Setting ip_checkinterface mostly implements the receive side of
                    175:  * the Strong ES model described in RFC 1122, but since the routing table
                    176:  * and transmit implementation do not implement the Strong ES model,
                    177:  * setting this to 1 results in an odd hybrid.
                    178:  *
                    179:  * XXX - ip_checkinterface currently must be disabled if you use ipnat
                    180:  * to translate the destination address to another local interface.
                    181:  *
                    182:  * XXX - ip_checkinterface must be disabled if you add IP aliases
                    183:  * to the loopback interface instead of the interface where the
                    184:  * packets for those addresses are received.
                    185:  */
1.318     rmind     186: static int             ip_checkinterface       __read_mostly = 0;
1.165     christos  187:
1.60      kml       188: struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
                    189:
1.318     rmind     190: pktqueue_t *           ip_pktq                 __read_mostly;
                    191: pfil_head_t *          inet_pfil_hook          __read_mostly;
                    192: ipid_state_t *         ip_ids                  __read_mostly;
                    193: percpu_t *             ipstat_percpu           __read_mostly;
                    194:
1.340     ozaki-r   195: static percpu_t                *ipforward_rt_percpu    __cacheline_aligned;
1.286     tls       196:
1.183     jonathan  197: uint16_t ip_id;
1.75      thorpej   198:
1.135     thorpej   199: #ifdef INET_CSUM_COUNTERS
                    200: #include <sys/device.h>
                    201:
                    202: struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    203:     NULL, "inet", "hwcsum bad");
                    204: struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    205:     NULL, "inet", "hwcsum ok");
                    206: struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
                    207:     NULL, "inet", "swcsum");
                    208:
                    209: #define        INET_CSUM_COUNTER_INCR(ev)      (ev)->ev_count++
                    210:
1.201     matt      211: EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
                    212: EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
                    213: EVCNT_ATTACH_STATIC(ip_swcsum);
                    214:
1.135     thorpej   215: #else
                    216:
                    217: #define        INET_CSUM_COUNTER_INCR(ev)      /* nothing */
                    218:
                    219: #endif /* INET_CSUM_COUNTERS */
                    220:
1.1       cgd       221: /*
1.354     ozaki-r   222:  * Used to save the IP options in case a protocol wants to respond
1.1       cgd       223:  * to an incoming packet over the same route if the packet got here
                    224:  * using IP source routing.  This allows connection establishment and
                    225:  * maintenance when the remote end is on a network that is not known
                    226:  * to us.
                    227:  */
1.354     ozaki-r   228: struct ip_srcrt {
                    229:        int             isr_nhops;                 /* number of hops */
                    230:        struct in_addr  isr_dst;                   /* final destination */
                    231:        char            isr_nop;                   /* one NOP to align */
                    232:        char            isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */
                    233:        struct in_addr  isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)];
                    234: };
1.1       cgd       235:
1.295     dyoung    236: static int ip_drainwanted;
                    237:
1.354     ozaki-r   238: static void save_rte(struct mbuf *, u_char *, struct in_addr);
1.35      mycroft   239:
1.164     matt      240: #ifdef MBUFTRACE
1.234     dogcow    241: struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
                    242: struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
1.164     matt      243: #endif
                    244:
1.318     rmind     245: static void            ipintr(void *);
1.312     rmind     246: static void            ip_input(struct mbuf *);
1.329     ozaki-r   247: static void            ip_forward(struct mbuf *, int, struct ifnet *);
1.311     rmind     248: static bool            ip_dooptions(struct mbuf *);
1.346     ozaki-r   249: static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *);
1.311     rmind     250: static void            sysctl_net_inet_ip_setup(struct sysctllog **);
1.284     pooka     251:
1.333     ozaki-r   252: static struct in_ifaddr        *ip_match_our_address(struct ifnet *, struct ip *,
                    253:                            int *);
                    254: static struct in_ifaddr        *ip_match_our_address_broadcast(struct ifnet *,
                    255:                            struct ip *);
                    256:
1.344     ozaki-r   257: #ifdef NET_MPSAFE
                    258: #define        SOFTNET_LOCK()          mutex_enter(softnet_lock)
                    259: #define        SOFTNET_UNLOCK()        mutex_exit(softnet_lock)
                    260: #else
1.318     rmind     261: #define        SOFTNET_LOCK()          KASSERT(mutex_owned(softnet_lock))
                    262: #define        SOFTNET_UNLOCK()        KASSERT(mutex_owned(softnet_lock))
1.344     ozaki-r   263: #endif
1.318     rmind     264:
1.1       cgd       265: /*
                    266:  * IP initialization: fill in IP protocol switch table.
                    267:  * All protocols not implemented in kernel go to raw IP protocol handler.
                    268:  */
1.8       mycroft   269: void
1.211     perry     270: ip_init(void)
1.1       cgd       271: {
1.199     matt      272:        const struct protosw *pr;
1.1       cgd       273:
1.311     rmind     274:        in_init();
1.284     pooka     275:        sysctl_net_inet_ip_setup(NULL);
                    276:
1.311     rmind     277:        pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
                    278:        KASSERT(pr != NULL);
1.275     pooka     279:
1.319     ozaki-r   280:        ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
1.318     rmind     281:        KASSERT(ip_pktq != NULL);
                    282:
1.328     riastrad  283:        for (u_int i = 0; i < IPPROTO_MAX; i++) {
                    284:                ip_protox[i] = pr - inetsw;
1.311     rmind     285:        }
1.328     riastrad  286:        for (pr = inetdomain.dom_protosw;
                    287:            pr < inetdomain.dom_protoswNPROTOSW; pr++)
1.1       cgd       288:                if (pr->pr_domain->dom_family == PF_INET &&
                    289:                    pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
1.328     riastrad  290:                        ip_protox[pr->pr_protocol] = pr - inetsw;
1.192     jonathan  291:
1.288     rmind     292:        ip_reass_init();
1.190     jonathan  293:
1.291     rmind     294:        ip_ids = ip_id_init();
1.323     ozaki-r   295:        ip_id = time_uptime & 0xfffff;
1.194     jonathan  296:
1.73      thorpej   297: #ifdef GATEWAY
1.311     rmind     298:        ipflow_init();
1.73      thorpej   299: #endif
1.121     thorpej   300:
                    301:        /* Register our Packet Filter hook. */
1.308     rmind     302:        inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
                    303:        KASSERT(inet_pfil_hook != NULL);
1.135     thorpej   304:
1.164     matt      305: #ifdef MBUFTRACE
                    306:        MOWNER_ATTACH(&ip_tx_mowner);
                    307:        MOWNER_ATTACH(&ip_rx_mowner);
1.373     maxv      308: #endif
1.266     thorpej   309:
                    310:        ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
1.340     ozaki-r   311:        ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
1.352     ozaki-r   312:        ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
1.1       cgd       313: }
                    314:
1.333     ozaki-r   315: static struct in_ifaddr *
                    316: ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
                    317: {
                    318:        struct in_ifaddr *ia = NULL;
                    319:        int checkif;
                    320:
                    321:        /*
                    322:         * Enable a consistency check between the destination address
                    323:         * and the arrival interface for a unicast packet (the RFC 1122
                    324:         * strong ES model) if IP forwarding is disabled and the packet
                    325:         * is not locally generated.
                    326:         *
                    327:         * XXX - Checking also should be disabled if the destination
                    328:         * address is ipnat'ed to a different interface.
                    329:         *
                    330:         * XXX - Checking is incompatible with IP aliases added
                    331:         * to the loopback interface instead of the interface where
                    332:         * the packets are received.
                    333:         *
                    334:         * XXX - We need to add a per ifaddr flag for this so that
                    335:         * we get finer grain control.
                    336:         */
                    337:        checkif = ip_checkinterface && (ipforwarding == 0) &&
                    338:            (ifp->if_flags & IFF_LOOPBACK) == 0;
                    339:
1.334     ozaki-r   340:        IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
1.333     ozaki-r   341:                if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
                    342:                        if (ia->ia4_flags & IN_IFF_NOTREADY)
                    343:                                continue;
                    344:                        if (checkif && ia->ia_ifp != ifp)
                    345:                                continue;
1.363     roy       346:                        if ((ia->ia_ifp->if_flags & IFF_UP) == 0) {
1.338     ozaki-r   347:                                (*downmatch)++;
1.363     roy       348:                                continue;
                    349:                        }
                    350:                        if (ia->ia4_flags & IN_IFF_DETACHED &&
                    351:                            (ifp->if_flags & IFF_LOOPBACK) == 0)
                    352:                                continue;
                    353:                        break;
1.333     ozaki-r   354:                }
                    355:        }
                    356:
                    357:        return ia;
                    358: }
                    359:
                    360: static struct in_ifaddr *
                    361: ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
                    362: {
                    363:        struct in_ifaddr *ia = NULL;
                    364:        struct ifaddr *ifa;
                    365:
1.336     ozaki-r   366:        IFADDR_READER_FOREACH(ifa, ifp) {
1.333     ozaki-r   367:                if (ifa->ifa_addr->sa_family != AF_INET)
                    368:                        continue;
                    369:                ia = ifatoia(ifa);
1.363     roy       370:                if (ia->ia4_flags & IN_IFF_NOTREADY)
                    371:                        continue;
                    372:                if (ia->ia4_flags & IN_IFF_DETACHED &&
                    373:                    (ifp->if_flags & IFF_LOOPBACK) == 0)
1.333     ozaki-r   374:                        continue;
                    375:                if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
                    376:                    in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
                    377:                    /*
                    378:                     * Look for all-0's host part (old broadcast addr),
                    379:                     * either for subnet or net.
                    380:                     */
                    381:                    ip->ip_dst.s_addr == ia->ia_subnet ||
                    382:                    ip->ip_dst.s_addr == ia->ia_net)
                    383:                        goto matched;
                    384:                /*
                    385:                 * An interface with IP address zero accepts
                    386:                 * all packets that arrive on that interface.
                    387:                 */
                    388:                if (in_nullhost(ia->ia_addr.sin_addr))
                    389:                        goto matched;
                    390:        }
                    391:        ia = NULL;
                    392:
                    393: matched:
                    394:        return ia;
                    395: }
                    396:
1.1       cgd       397: /*
1.318     rmind     398:  * IP software interrupt routine.
1.89      itojun    399:  */
1.318     rmind     400: static void
                    401: ipintr(void *arg __unused)
1.89      itojun    402: {
                    403:        struct mbuf *m;
1.286     tls       404:
1.318     rmind     405:        KASSERT(cpu_softintr_p());
1.89      itojun    406:
1.376     ozaki-r   407:        SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.318     rmind     408:        while ((m = pktq_dequeue(ip_pktq)) != NULL) {
1.89      itojun    409:                ip_input(m);
                    410:        }
1.376     ozaki-r   411:        SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.89      itojun    412: }
                    413:
                    414: /*
1.318     rmind     415:  * IP input routine.  Checksum and byte swap header.  If fragmented
1.1       cgd       416:  * try to reassemble.  Process options.  Pass to next level.
                    417:  */
1.312     rmind     418: static void
1.89      itojun    419: ip_input(struct mbuf *m)
1.1       cgd       420: {
1.109     augustss  421:        struct ip *ip = NULL;
1.339     ozaki-r   422:        struct in_ifaddr *ia = NULL;
1.288     rmind     423:        int hlen = 0, len;
1.100     itojun    424:        int downmatch;
1.169     itojun    425:        int srcrt = 0;
1.314     rmind     426:        ifnet_t *ifp;
1.329     ozaki-r   427:        struct psref psref;
1.339     ozaki-r   428:        int s;
1.1       cgd       429:
1.318     rmind     430:        KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
                    431:            "interrupt handler; synchronization assumptions violated");
                    432:
1.164     matt      433:        MCLAIM(m, &ip_rx_mowner);
1.289     rmind     434:        KASSERT((m->m_flags & M_PKTHDR) != 0);
1.329     ozaki-r   435:
                    436:        ifp = m_get_rcvif_psref(m, &psref);
1.330     ozaki-r   437:        if (__predict_false(ifp == NULL))
1.332     ozaki-r   438:                goto out;
1.164     matt      439:
1.1       cgd       440:        /*
                    441:         * If no IP addresses have been set yet but the interfaces
                    442:         * are receiving, can't do anything with incoming packets yet.
1.318     rmind     443:         * Note: we pre-check without locks held.
1.1       cgd       444:         */
1.335     ozaki-r   445:        if (IN_ADDRLIST_READER_EMPTY())
1.332     ozaki-r   446:                goto out;
1.266     thorpej   447:        IP_STATINC(IP_STAT_TOTAL);
1.318     rmind     448:
1.154     thorpej   449:        /*
                    450:         * If the IP header is not aligned, slurp it up into a new
                    451:         * mbuf with space for link headers, in the event we forward
                    452:         * it.  Otherwise, if it is aligned, make sure the entire
                    453:         * base IP header is in the first mbuf of the chain.
                    454:         */
1.244     christos  455:        if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
1.154     thorpej   456:                if ((m = m_copyup(m, sizeof(struct ip),
1.365     maxv      457:                    (max_linkhdr + 3) & ~3)) == NULL) {
1.154     thorpej   458:                        /* XXXJRT new stat, please */
1.266     thorpej   459:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   460:                        goto out;
1.154     thorpej   461:                }
1.365     maxv      462:        } else if (__predict_false(m->m_len < sizeof(struct ip))) {
                    463:                if ((m = m_pullup(m, sizeof(struct ip))) == NULL) {
1.266     thorpej   464:                        IP_STATINC(IP_STAT_TOOSMALL);
1.329     ozaki-r   465:                        goto out;
1.154     thorpej   466:                }
1.1       cgd       467:        }
                    468:        ip = mtod(m, struct ip *);
1.13      mycroft   469:        if (ip->ip_v != IPVERSION) {
1.266     thorpej   470:                IP_STATINC(IP_STAT_BADVERS);
1.332     ozaki-r   471:                goto out;
1.13      mycroft   472:        }
1.1       cgd       473:        hlen = ip->ip_hl << 2;
                    474:        if (hlen < sizeof(struct ip)) { /* minimum header length */
1.266     thorpej   475:                IP_STATINC(IP_STAT_BADHLEN);
1.332     ozaki-r   476:                goto out;
1.1       cgd       477:        }
                    478:        if (hlen > m->m_len) {
1.298     liamjfoy  479:                if ((m = m_pullup(m, hlen)) == NULL) {
1.266     thorpej   480:                        IP_STATINC(IP_STAT_BADHLEN);
1.329     ozaki-r   481:                        goto out;
1.1       cgd       482:                }
                    483:                ip = mtod(m, struct ip *);
                    484:        }
1.98      thorpej   485:
1.85      hwr       486:        /*
1.99      thorpej   487:         * RFC1122: packets with a multicast source address are
1.98      thorpej   488:         * not allowed.
1.85      hwr       489:         */
                    490:        if (IN_MULTICAST(ip->ip_src.s_addr)) {
1.266     thorpej   491:                IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   492:                goto out;
1.129     itojun    493:        }
                    494:
                    495:        /* 127/8 must not appear on wire - RFC1122 */
                    496:        if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
                    497:            (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
1.314     rmind     498:                if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
1.266     thorpej   499:                        IP_STATINC(IP_STAT_BADADDR);
1.332     ozaki-r   500:                        goto out;
1.130     itojun    501:                }
1.85      hwr       502:        }
                    503:
1.135     thorpej   504:        switch (m->m_pkthdr.csum_flags &
1.365     maxv      505:                ((ifp->if_csum_flags_rx & M_CSUM_IPv4) | M_CSUM_IPv4_BAD)) {
1.135     thorpej   506:        case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
                    507:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
1.332     ozaki-r   508:                IP_STATINC(IP_STAT_BADSUM);
                    509:                goto out;
1.135     thorpej   510:
                    511:        case M_CSUM_IPv4:
                    512:                /* Checksum was okay. */
                    513:                INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
                    514:                break;
                    515:
                    516:        default:
1.206     thorpej   517:                /*
                    518:                 * Must compute it ourselves.  Maybe skip checksum on
                    519:                 * loopback interfaces.
                    520:                 */
1.314     rmind     521:                if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
                    522:                    ip_do_loopback_cksum)) {
1.206     thorpej   523:                        INET_CSUM_COUNTER_INCR(&ip_swcsum);
1.332     ozaki-r   524:                        if (in_cksum(m, hlen) != 0) {
                    525:                                IP_STATINC(IP_STAT_BADSUM);
                    526:                                goto out;
                    527:                        }
1.206     thorpej   528:                }
1.135     thorpej   529:                break;
1.1       cgd       530:        }
                    531:
1.121     thorpej   532:        /* Retrieve the packet length. */
                    533:        len = ntohs(ip->ip_len);
1.81      proff     534:
                    535:        /*
                    536:         * Check for additional length bogosity
                    537:         */
1.84      proff     538:        if (len < hlen) {
1.266     thorpej   539:                IP_STATINC(IP_STAT_BADLEN);
1.332     ozaki-r   540:                goto out;
1.81      proff     541:        }
1.1       cgd       542:
                    543:        /*
1.365     maxv      544:         * Check that the amount of data in the buffers is at least as much
                    545:         * as the IP header would have us expect. Trim mbufs if longer than
                    546:         * we expect. Drop packet if shorter than we expect.
1.1       cgd       547:         */
1.35      mycroft   548:        if (m->m_pkthdr.len < len) {
1.266     thorpej   549:                IP_STATINC(IP_STAT_TOOSHORT);
1.332     ozaki-r   550:                goto out;
1.1       cgd       551:        }
1.35      mycroft   552:        if (m->m_pkthdr.len > len) {
1.1       cgd       553:                if (m->m_len == m->m_pkthdr.len) {
1.35      mycroft   554:                        m->m_len = len;
                    555:                        m->m_pkthdr.len = len;
1.1       cgd       556:                } else
1.35      mycroft   557:                        m_adj(m, len - m->m_pkthdr.len);
1.1       cgd       558:        }
                    559:
1.64      thorpej   560:        /*
                    561:         * Assume that we can create a fast-forward IP flow entry
                    562:         * based on this packet.
                    563:         */
                    564:        m->m_flags |= M_CANFASTFWD;
                    565:
1.33      mrg       566:        /*
1.64      thorpej   567:         * Run through list of hooks for input packets.  If there are any
                    568:         * filters which require that additional packets in the flow are
                    569:         * not fast-forwarded, they must clear the M_CANFASTFWD flag.
                    570:         * Note that filters must _never_ set this flag, as another filter
                    571:         * in the list may have previously cleared it.
1.378     maxv      572:         *
                    573:         * Don't call hooks if the packet has already been processed by
                    574:         * IPsec (encapsulated, tunnel mode).
1.33      mrg       575:         */
1.304     christos  576: #if defined(IPSEC)
1.317     christos  577:        if (!ipsec_used || !ipsec_indone(m))
1.127     itojun    578: #else
                    579:        if (1)
                    580: #endif
                    581:        {
1.314     rmind     582:                struct in_addr odst = ip->ip_dst;
1.318     rmind     583:                bool freed;
1.169     itojun    584:
1.318     rmind     585:                freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
                    586:                if (freed || m == NULL) {
1.343     ozaki-r   587:                        m = NULL;
1.329     ozaki-r   588:                        goto out;
1.318     rmind     589:                }
1.127     itojun    590:                ip = mtod(m, struct ip *);
1.142     darrenr   591:                hlen = ip->ip_hl << 2;
1.318     rmind     592:
1.205     darrenr   593:                /*
                    594:                 * XXX The setting of "srcrt" here is to prevent ip_forward()
                    595:                 * from generating ICMP redirects for packets that have
                    596:                 * been redirected by a hook back out on to the same LAN that
                    597:                 * they came from and is not an indication that the packet
1.373     maxv      598:                 * is being influenced by source routing options.  This
1.205     darrenr   599:                 * allows things like
                    600:                 * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
                    601:                 * where tlp0 is both on the 1.1.1.0/24 network and is the
                    602:                 * default route for hosts on 1.1.1.0/24.  Of course this
                    603:                 * also requires a "map tlp0 ..." to complete the story.
                    604:                 * One might argue whether or not this kind of network config.
1.212     perry     605:                 * should be supported in this manner...
1.205     darrenr   606:                 */
1.169     itojun    607:                srcrt = (odst.s_addr != ip->ip_dst.s_addr);
1.127     itojun    608:        }
1.123     thorpej   609:
                    610: #ifdef ALTQ
                    611:        /* XXX Temporary until ALTQ is changed to use a pfil hook */
1.318     rmind     612:        if (altq_input) {
                    613:                SOFTNET_LOCK();
                    614:                if ((*altq_input)(m, AF_INET) == 0) {
                    615:                        /* Packet dropped by traffic conditioner. */
                    616:                        SOFTNET_UNLOCK();
1.343     ozaki-r   617:                        m = NULL;
1.329     ozaki-r   618:                        goto out;
1.318     rmind     619:                }
                    620:                SOFTNET_UNLOCK();
1.123     thorpej   621:        }
                    622: #endif
1.121     thorpej   623:
                    624:        /*
1.1       cgd       625:         * Process options and, if not destined for us,
                    626:         * ship it on.  ip_dooptions returns 1 when an
                    627:         * error was detected (causing an icmp message
                    628:         * to be sent and the original packet to be freed).
                    629:         */
1.365     maxv      630:        if (hlen > sizeof(struct ip) && ip_dooptions(m)) {
1.343     ozaki-r   631:                m = NULL;
1.329     ozaki-r   632:                goto out;
1.343     ozaki-r   633:        }
1.1       cgd       634:
                    635:        /*
                    636:         * Check our list of addresses, to see if the packet is for us.
1.100     itojun    637:         *
                    638:         * Traditional 4.4BSD did not consult IFF_UP at all.
                    639:         * The behavior here is to treat addresses on !IFF_UP interface
1.321     roy       640:         * or IN_IFF_NOTREADY addresses as not mine.
1.1       cgd       641:         */
1.100     itojun    642:        downmatch = 0;
1.339     ozaki-r   643:        s = pserialize_read_enter();
1.333     ozaki-r   644:        ia = ip_match_our_address(ifp, ip, &downmatch);
1.339     ozaki-r   645:        if (ia != NULL) {
                    646:                pserialize_read_exit(s);
1.86      thorpej   647:                goto ours;
1.339     ozaki-r   648:        }
1.333     ozaki-r   649:
1.315     christos  650:        if (ifp->if_flags & IFF_BROADCAST) {
1.333     ozaki-r   651:                ia = ip_match_our_address_broadcast(ifp, ip);
1.339     ozaki-r   652:                if (ia != NULL) {
                    653:                        pserialize_read_exit(s);
1.333     ozaki-r   654:                        goto ours;
1.339     ozaki-r   655:                }
1.1       cgd       656:        }
1.339     ozaki-r   657:        pserialize_read_exit(s);
1.333     ozaki-r   658:
1.18      mycroft   659:        if (IN_MULTICAST(ip->ip_dst.s_addr)) {
1.4       hpeyerl   660: #ifdef MROUTING
                    661:                extern struct socket *ip_mrouter;
1.10      brezak    662:
1.4       hpeyerl   663:                if (ip_mrouter) {
                    664:                        /*
                    665:                         * If we are acting as a multicast router, all
                    666:                         * incoming multicast packets are passed to the
                    667:                         * kernel-level multicast forwarding function.
                    668:                         * The packet is returned (relatively) intact; if
                    669:                         * ip_mforward() returns a non-zero value, the packet
                    670:                         * must be discarded, else it may be accepted below.
                    671:                         *
                    672:                         * (The IP ident field is put in the same byte order
                    673:                         * as expected when ip_mforward() is called from
                    674:                         * ip_output().)
                    675:                         */
1.318     rmind     676:                        SOFTNET_LOCK();
1.314     rmind     677:                        if (ip_mforward(m, ifp) != 0) {
1.318     rmind     678:                                SOFTNET_UNLOCK();
1.266     thorpej   679:                                IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   680:                                goto out;
1.4       hpeyerl   681:                        }
1.318     rmind     682:                        SOFTNET_UNLOCK();
1.4       hpeyerl   683:
                    684:                        /*
                    685:                         * The process-level routing demon needs to receive
                    686:                         * all multicast IGMP packets, whether or not this
                    687:                         * host belongs to their destination groups.
                    688:                         */
1.318     rmind     689:                        if (ip->ip_p == IPPROTO_IGMP) {
1.4       hpeyerl   690:                                goto ours;
1.318     rmind     691:                        }
1.266     thorpej   692:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.4       hpeyerl   693:                }
                    694: #endif
                    695:                /*
                    696:                 * See if we belong to the destination multicast group on the
                    697:                 * arrival interface.
                    698:                 */
1.316     rmind     699:                if (!in_multi_group(ip->ip_dst, ifp, 0)) {
1.266     thorpej   700:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.332     ozaki-r   701:                        goto out;
1.4       hpeyerl   702:                }
                    703:                goto ours;
                    704:        }
1.19      mycroft   705:        if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
1.35      mycroft   706:            in_nullhost(ip->ip_dst))
1.1       cgd       707:                goto ours;
                    708:
                    709:        /*
                    710:         * Not for us; forward if possible and desirable.
                    711:         */
                    712:        if (ipforwarding == 0) {
1.329     ozaki-r   713:                m_put_rcvif_psref(ifp, &psref);
1.266     thorpej   714:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd       715:                m_freem(m);
1.100     itojun    716:        } else {
                    717:                /*
                    718:                 * If ip_dst matched any of my address on !IFF_UP interface,
                    719:                 * and there's no IFF_UP interface that matches ip_dst,
                    720:                 * send icmp unreach.  Forwarding it will result in in-kernel
                    721:                 * forwarding loop till TTL goes to 0.
                    722:                 */
                    723:                if (downmatch) {
1.329     ozaki-r   724:                        m_put_rcvif_psref(ifp, &psref);
1.100     itojun    725:                        icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
1.266     thorpej   726:                        IP_STATINC(IP_STAT_CANTFORWARD);
1.100     itojun    727:                        return;
                    728:                }
1.304     christos  729: #ifdef IPSEC
1.359     ozaki-r   730:                /* Check the security policy (SP) for the packet */
1.318     rmind     731:                if (ipsec_used) {
1.379   ! maxv      732:                        if (ipsec4_input(m, IP_FORWARDING) != 0) {
1.332     ozaki-r   733:                                goto out;
1.318     rmind     734:                        }
1.173     jonathan  735:                }
1.305     rmind     736: #endif
1.329     ozaki-r   737:                ip_forward(m, srcrt, ifp);
                    738:                m_put_rcvif_psref(ifp, &psref);
1.100     itojun    739:        }
1.89      itojun    740:        return;
1.1       cgd       741:
                    742: ours:
1.329     ozaki-r   743:        m_put_rcvif_psref(ifp, &psref);
1.331     ozaki-r   744:        ifp = NULL;
1.329     ozaki-r   745:
1.1       cgd       746:        /*
                    747:         * If offset or IP_MF are set, must reassemble.
                    748:         */
1.155     itojun    749:        if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
1.289     rmind     750:                /*
                    751:                 * Pass to IP reassembly mechanism.
                    752:                 */
1.290     rmind     753:                if (ip_reass_packet(&m, ip) != 0) {
1.289     rmind     754:                        /* Failed; invalid fragment(s) or packet. */
1.332     ozaki-r   755:                        goto out;
1.16      cgd       756:                }
1.290     rmind     757:                if (m == NULL) {
1.289     rmind     758:                        /* More fragments should come; silently return. */
1.332     ozaki-r   759:                        goto out;
1.289     rmind     760:                }
1.290     rmind     761:                /*
                    762:                 * Reassembly is done, we have the final packet.
1.365     maxv      763:                 * Update cached data in local variable(s).
1.290     rmind     764:                 */
1.289     rmind     765:                ip = mtod(m, struct ip *);
                    766:                hlen = ip->ip_hl << 2;
1.79      mycroft   767:        }
1.128     itojun    768:
1.304     christos  769: #ifdef IPSEC
1.173     jonathan  770:        /*
1.305     rmind     771:         * Enforce IPsec policy checking if we are seeing last header.
                    772:         * Note that we do not visit this with protocols with PCB layer
                    773:         * code - like UDP/TCP/raw IP.
1.173     jonathan  774:         */
1.317     christos  775:        if (ipsec_used &&
1.328     riastrad  776:            (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
1.305     rmind     777:                if (ipsec4_input(m, 0) != 0) {
1.332     ozaki-r   778:                        goto out;
1.173     jonathan  779:                }
                    780:        }
1.305     rmind     781: #endif
1.1       cgd       782:
                    783:        /*
                    784:         * Switch out to protocol's input routine.
                    785:         */
1.82      aidan     786: #if IFA_STATS
1.374     maxv      787:        if (ia) {
1.339     ozaki-r   788:                struct in_ifaddr *_ia;
                    789:                /*
                    790:                 * Keep a reference from ip_match_our_address with psref
                    791:                 * is expensive, so explore ia here again.
                    792:                 */
                    793:                s = pserialize_read_enter();
1.342     ozaki-r   794:                _ia = in_get_ia(ip->ip_dst);
1.339     ozaki-r   795:                _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
                    796:                pserialize_read_exit(s);
                    797:        }
1.82      aidan     798: #endif
1.266     thorpej   799:        IP_STATINC(IP_STAT_DELIVERED);
1.89      itojun    800:
1.318     rmind     801:        const int off = hlen, nh = ip->ip_p;
                    802:
1.328     riastrad  803:        (*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
1.89      itojun    804:        return;
1.135     thorpej   805:
1.329     ozaki-r   806: out:
                    807:        m_put_rcvif_psref(ifp, &psref);
1.332     ozaki-r   808:        if (m != NULL)
                    809:                m_freem(m);
1.1       cgd       810: }
                    811:
                    812: /*
1.288     rmind     813:  * IP timer processing.
1.1       cgd       814:  */
1.8       mycroft   815: void
1.211     perry     816: ip_slowtimo(void)
1.1       cgd       817: {
1.268     ad        818:
1.362     ozaki-r   819:        SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE();
1.1       cgd       820:
1.288     rmind     821:        ip_reass_slowtimo();
1.268     ad        822:
1.362     ozaki-r   823:        SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE();
1.1       cgd       824: }
                    825:
                    826: /*
1.288     rmind     827:  * IP drain processing.
1.1       cgd       828:  */
1.8       mycroft   829: void
1.211     perry     830: ip_drain(void)
1.1       cgd       831: {
                    832:
1.268     ad        833:        KERNEL_LOCK(1, NULL);
1.288     rmind     834:        ip_reass_drain();
1.268     ad        835:        KERNEL_UNLOCK_ONE(NULL);
1.1       cgd       836: }
                    837:
                    838: /*
1.311     rmind     839:  * ip_dooptions: perform option processing on a datagram, possibly discarding
                    840:  * it if bad options are encountered, or forwarding it if source-routed.
                    841:  *
                    842:  * => Returns true if packet has been forwarded/freed.
                    843:  * => Returns false if the packet should be processed further.
1.1       cgd       844:  */
1.311     rmind     845: static bool
1.211     perry     846: ip_dooptions(struct mbuf *m)
1.1       cgd       847: {
1.109     augustss  848:        struct ip *ip = mtod(m, struct ip *);
                    849:        u_char *cp, *cp0;
                    850:        struct ip_timestamp *ipt;
                    851:        struct in_ifaddr *ia;
1.1       cgd       852:        int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
1.369     maxv      853:        int srr_present, rr_present, ts_present;
1.104     thorpej   854:        struct in_addr dst;
1.1       cgd       855:        n_time ntime;
1.349     ozaki-r   856:        struct ifaddr *ifa = NULL;
1.339     ozaki-r   857:        int s;
1.1       cgd       858:
1.369     maxv      859:        srr_present = 0;
1.368     maxv      860:        rr_present = 0;
                    861:        ts_present = 0;
                    862:
1.13      mycroft   863:        dst = ip->ip_dst;
1.1       cgd       864:        cp = (u_char *)(ip + 1);
1.365     maxv      865:        cnt = (ip->ip_hl << 2) - sizeof(struct ip);
1.1       cgd       866:        for (; cnt > 0; cnt -= optlen, cp += optlen) {
                    867:                opt = cp[IPOPT_OPTVAL];
                    868:                if (opt == IPOPT_EOL)
                    869:                        break;
                    870:                if (opt == IPOPT_NOP)
                    871:                        optlen = 1;
                    872:                else {
1.113     itojun    873:                        if (cnt < IPOPT_OLEN + sizeof(*cp)) {
                    874:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    875:                                goto bad;
                    876:                        }
1.1       cgd       877:                        optlen = cp[IPOPT_OLEN];
1.114     itojun    878:                        if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
1.1       cgd       879:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    880:                                goto bad;
                    881:                        }
                    882:                }
                    883:                switch (opt) {
                    884:
                    885:                default:
                    886:                        break;
                    887:
                    888:                /*
                    889:                 * Source routing with record.
                    890:                 * Find interface with current destination address.
                    891:                 * If none on this machine then drop if strictly routed,
                    892:                 * or do nothing if loosely routed.
                    893:                 * Record interface address and bring up next address
                    894:                 * component.  If strictly routed make sure next
                    895:                 * address is on directly accessible net.
                    896:                 */
                    897:                case IPOPT_LSRR:
1.346     ozaki-r   898:                case IPOPT_SSRR: {
                    899:                        struct psref psref;
1.353     ozaki-r   900:                        struct sockaddr_in ipaddr = {
                    901:                            .sin_len = sizeof(ipaddr),
                    902:                            .sin_family = AF_INET,
                    903:                        };
                    904:
1.47      cjs       905:                        if (ip_allowsrcrt == 0) {
                    906:                                type = ICMP_UNREACH;
                    907:                                code = ICMP_UNREACH_NET_PROHIB;
                    908:                                goto bad;
                    909:                        }
1.369     maxv      910:                        if (srr_present++) {
                    911:                                code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
                    912:                                goto bad;
1.368     maxv      913:                        }
1.114     itojun    914:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    915:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    916:                                goto bad;
                    917:                        }
1.1       cgd       918:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    919:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    920:                                goto bad;
                    921:                        }
                    922:                        ipaddr.sin_addr = ip->ip_dst;
1.339     ozaki-r   923:
                    924:                        s = pserialize_read_enter();
                    925:                        ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                    926:                        if (ifa == NULL) {
                    927:                                pserialize_read_exit(s);
1.1       cgd       928:                                if (opt == IPOPT_SSRR) {
                    929:                                        type = ICMP_UNREACH;
                    930:                                        code = ICMP_UNREACH_SRCFAIL;
                    931:                                        goto bad;
                    932:                                }
                    933:                                /*
                    934:                                 * Loose routing, and not at next destination
                    935:                                 * yet; nothing to do except forward.
                    936:                                 */
                    937:                                break;
                    938:                        }
1.339     ozaki-r   939:                        pserialize_read_exit(s);
                    940:
1.1       cgd       941:                        off--;                  /* 0 origin */
1.112     sommerfe  942:                        if ((off + sizeof(struct in_addr)) > optlen) {
1.1       cgd       943:                                /*
                    944:                                 * End of source route.  Should be for us.
                    945:                                 */
1.354     ozaki-r   946:                                save_rte(m, cp, ip->ip_src);
1.1       cgd       947:                                break;
                    948:                        }
                    949:                        /*
                    950:                         * locate outgoing interface
                    951:                         */
1.281     tsutsui   952:                        memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
1.1       cgd       953:                            sizeof(ipaddr.sin_addr));
1.339     ozaki-r   954:                        if (opt == IPOPT_SSRR) {
1.346     ozaki-r   955:                                ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
                    956:                                    &psref);
1.339     ozaki-r   957:                                if (ifa != NULL)
                    958:                                        ia = ifatoia(ifa);
                    959:                                else
                    960:                                        ia = NULL;
                    961:                        } else {
1.346     ozaki-r   962:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r   963:                        }
                    964:                        if (ia == NULL) {
1.1       cgd       965:                                type = ICMP_UNREACH;
                    966:                                code = ICMP_UNREACH_SRCFAIL;
                    967:                                goto bad;
                    968:                        }
                    969:                        ip->ip_dst = ipaddr.sin_addr;
1.377     maxv      970:                        memcpy(cp + off, &ia->ia_addr.sin_addr,
                    971:                            sizeof(struct in_addr));
1.346     ozaki-r   972:                        ia4_release(ia, &psref);
1.1       cgd       973:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
1.13      mycroft   974:                        /*
                    975:                         * Let ip_intr's mcast routing check handle mcast pkts
                    976:                         */
1.18      mycroft   977:                        forward = !IN_MULTICAST(ip->ip_dst.s_addr);
1.1       cgd       978:                        break;
1.346     ozaki-r   979:                    }
1.1       cgd       980:
1.346     ozaki-r   981:                case IPOPT_RR: {
                    982:                        struct psref psref;
1.353     ozaki-r   983:                        struct sockaddr_in ipaddr = {
                    984:                            .sin_len = sizeof(ipaddr),
                    985:                            .sin_family = AF_INET,
                    986:                        };
                    987:
1.368     maxv      988:                        if (rr_present++) {
                    989:                                code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
                    990:                                goto bad;
                    991:                        }
1.114     itojun    992:                        if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
                    993:                                code = &cp[IPOPT_OLEN] - (u_char *)ip;
                    994:                                goto bad;
                    995:                        }
1.1       cgd       996:                        if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
                    997:                                code = &cp[IPOPT_OFFSET] - (u_char *)ip;
                    998:                                goto bad;
                    999:                        }
                   1000:                        /*
                   1001:                         * If no space remains, ignore.
                   1002:                         */
                   1003:                        off--;                  /* 0 origin */
1.112     sommerfe 1004:                        if ((off + sizeof(struct in_addr)) > optlen)
1.1       cgd      1005:                                break;
1.377     maxv     1006:                        memcpy((void *)&ipaddr.sin_addr, (void *)&ip->ip_dst,
1.1       cgd      1007:                            sizeof(ipaddr.sin_addr));
                   1008:                        /*
                   1009:                         * locate outgoing interface; if we're the destination,
                   1010:                         * use the incoming interface (should be same).
                   1011:                         */
1.346     ozaki-r  1012:                        ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
1.339     ozaki-r  1013:                        if (ifa == NULL) {
1.346     ozaki-r  1014:                                ia = ip_rtaddr(ipaddr.sin_addr, &psref);
1.339     ozaki-r  1015:                                if (ia == NULL) {
                   1016:                                        type = ICMP_UNREACH;
                   1017:                                        code = ICMP_UNREACH_HOST;
                   1018:                                        goto bad;
                   1019:                                }
                   1020:                        } else {
                   1021:                                ia = ifatoia(ifa);
1.1       cgd      1022:                        }
1.377     maxv     1023:                        memcpy(cp + off, &ia->ia_addr.sin_addr,
                   1024:                            sizeof(struct in_addr));
1.346     ozaki-r  1025:                        ia4_release(ia, &psref);
1.1       cgd      1026:                        cp[IPOPT_OFFSET] += sizeof(struct in_addr);
                   1027:                        break;
1.346     ozaki-r  1028:                    }
1.1       cgd      1029:
                   1030:                case IPOPT_TS:
                   1031:                        code = cp - (u_char *)ip;
                   1032:                        ipt = (struct ip_timestamp *)cp;
1.368     maxv     1033:                        if (ts_present++) {
                   1034:                                code = &cp[IPOPT_OPTVAL] - (u_char *)ip;
                   1035:                                goto bad;
                   1036:                        }
1.114     itojun   1037:                        if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
                   1038:                                code = (u_char *)&ipt->ipt_len - (u_char *)ip;
1.1       cgd      1039:                                goto bad;
1.114     itojun   1040:                        }
                   1041:                        if (ipt->ipt_ptr < 5) {
                   1042:                                code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
                   1043:                                goto bad;
                   1044:                        }
1.365     maxv     1045:                        if (ipt->ipt_ptr > ipt->ipt_len - sizeof(int32_t)) {
1.114     itojun   1046:                                if (++ipt->ipt_oflw == 0) {
                   1047:                                        code = (u_char *)&ipt->ipt_ptr -
                   1048:                                            (u_char *)ip;
1.1       cgd      1049:                                        goto bad;
1.114     itojun   1050:                                }
1.1       cgd      1051:                                break;
                   1052:                        }
1.104     thorpej  1053:                        cp0 = (cp + ipt->ipt_ptr - 1);
1.1       cgd      1054:                        switch (ipt->ipt_flg) {
                   1055:
                   1056:                        case IPOPT_TS_TSONLY:
                   1057:                                break;
                   1058:
1.329     ozaki-r  1059:                        case IPOPT_TS_TSANDADDR: {
                   1060:                                struct ifnet *rcvif;
1.339     ozaki-r  1061:                                int _s, _ss;
1.353     ozaki-r  1062:                                struct sockaddr_in ipaddr = {
                   1063:                                    .sin_len = sizeof(ipaddr),
                   1064:                                    .sin_family = AF_INET,
                   1065:                                };
1.329     ozaki-r  1066:
1.66      thorpej  1067:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1068:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1069:                                        code = (u_char *)&ipt->ipt_ptr -
                   1070:                                            (u_char *)ip;
1.1       cgd      1071:                                        goto bad;
1.114     itojun   1072:                                }
1.13      mycroft  1073:                                ipaddr.sin_addr = dst;
1.339     ozaki-r  1074:                                _ss = pserialize_read_enter();
                   1075:                                rcvif = m_get_rcvif(m, &_s);
1.349     ozaki-r  1076:                                if (__predict_true(rcvif != NULL)) {
                   1077:                                        ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
                   1078:                                            rcvif);
                   1079:                                }
1.339     ozaki-r  1080:                                m_put_rcvif(rcvif, &_s);
                   1081:                                if (ifa == NULL) {
                   1082:                                        pserialize_read_exit(_ss);
                   1083:                                        break;
                   1084:                                }
                   1085:                                ia = ifatoia(ifa);
1.377     maxv     1086:                                memcpy(cp0, &ia->ia_addr.sin_addr,
                   1087:                                    sizeof(struct in_addr));
1.339     ozaki-r  1088:                                pserialize_read_exit(_ss);
1.1       cgd      1089:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1090:                                break;
1.329     ozaki-r  1091:                        }
1.1       cgd      1092:
1.353     ozaki-r  1093:                        case IPOPT_TS_PRESPEC: {
                   1094:                                struct sockaddr_in ipaddr = {
                   1095:                                    .sin_len = sizeof(ipaddr),
                   1096:                                    .sin_family = AF_INET,
                   1097:                                };
                   1098:
1.66      thorpej  1099:                                if (ipt->ipt_ptr - 1 + sizeof(n_time) +
1.114     itojun   1100:                                    sizeof(struct in_addr) > ipt->ipt_len) {
                   1101:                                        code = (u_char *)&ipt->ipt_ptr -
                   1102:                                            (u_char *)ip;
1.1       cgd      1103:                                        goto bad;
1.114     itojun   1104:                                }
1.281     tsutsui  1105:                                memcpy(&ipaddr.sin_addr, cp0,
1.1       cgd      1106:                                    sizeof(struct in_addr));
1.339     ozaki-r  1107:                                s = pserialize_read_enter();
                   1108:                                ifa = ifa_ifwithaddr(sintosa(&ipaddr));
                   1109:                                if (ifa == NULL) {
                   1110:                                        pserialize_read_exit(s);
1.1       cgd      1111:                                        continue;
1.339     ozaki-r  1112:                                }
                   1113:                                pserialize_read_exit(s);
1.1       cgd      1114:                                ipt->ipt_ptr += sizeof(struct in_addr);
                   1115:                                break;
1.353     ozaki-r  1116:                            }
1.1       cgd      1117:
                   1118:                        default:
1.114     itojun   1119:                                /* XXX can't take &ipt->ipt_flg */
                   1120:                                code = (u_char *)&ipt->ipt_ptr -
                   1121:                                    (u_char *)ip + 1;
1.1       cgd      1122:                                goto bad;
                   1123:                        }
                   1124:                        ntime = iptime();
1.107     thorpej  1125:                        cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
1.244     christos 1126:                        memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
1.1       cgd      1127:                            sizeof(n_time));
                   1128:                        ipt->ipt_ptr += sizeof(n_time);
                   1129:                }
                   1130:        }
                   1131:        if (forward) {
1.329     ozaki-r  1132:                struct ifnet *rcvif;
1.339     ozaki-r  1133:                struct psref _psref;
1.329     ozaki-r  1134:
1.26      thorpej  1135:                if (ip_forwsrcrt == 0) {
                   1136:                        type = ICMP_UNREACH;
                   1137:                        code = ICMP_UNREACH_SRCFAIL;
                   1138:                        goto bad;
                   1139:                }
1.329     ozaki-r  1140:
1.339     ozaki-r  1141:                rcvif = m_get_rcvif_psref(m, &_psref);
1.330     ozaki-r  1142:                if (__predict_false(rcvif == NULL)) {
                   1143:                        type = ICMP_UNREACH;
                   1144:                        code = ICMP_UNREACH_HOST;
                   1145:                        goto bad;
                   1146:                }
1.329     ozaki-r  1147:                ip_forward(m, 1, rcvif);
1.339     ozaki-r  1148:                m_put_rcvif_psref(rcvif, &_psref);
1.311     rmind    1149:                return true;
1.13      mycroft  1150:        }
1.311     rmind    1151:        return false;
1.1       cgd      1152: bad:
1.13      mycroft  1153:        icmp_error(m, type, code, 0, 0);
1.266     thorpej  1154:        IP_STATINC(IP_STAT_BADOPTIONS);
1.311     rmind    1155:        return true;
1.1       cgd      1156: }
                   1157:
                   1158: /*
1.311     rmind    1159:  * ip_rtaddr: given address of next destination (final or next hop),
1.1       cgd      1160:  * return internet address info of interface to be used to get there.
                   1161:  */
1.311     rmind    1162: static struct in_ifaddr *
1.346     ozaki-r  1163: ip_rtaddr(struct in_addr dst, struct psref *psref)
1.1       cgd      1164: {
1.249     dyoung   1165:        struct rtentry *rt;
                   1166:        union {
                   1167:                struct sockaddr         dst;
                   1168:                struct sockaddr_in      dst4;
                   1169:        } u;
1.340     ozaki-r  1170:        struct route *ro;
1.249     dyoung   1171:
                   1172:        sockaddr_in_init(&u.dst4, &dst, 0);
                   1173:
1.340     ozaki-r  1174:        ro = percpu_getref(ipforward_rt_percpu);
                   1175:        rt = rtcache_lookup(ro, &u.dst);
1.345     ozaki-r  1176:        if (rt == NULL) {
                   1177:                percpu_putref(ipforward_rt_percpu);
                   1178:                return NULL;
                   1179:        }
                   1180:
1.346     ozaki-r  1181:        ia4_acquire(ifatoia(rt->rt_ifa), psref);
1.345     ozaki-r  1182:        rtcache_unref(rt, ro);
1.340     ozaki-r  1183:        percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1184:
                   1185:        return ifatoia(rt->rt_ifa);
1.1       cgd      1186: }
                   1187:
                   1188: /*
1.311     rmind    1189:  * save_rte: save incoming source route for use in replies, to be picked
                   1190:  * up later by ip_srcroute if the receiver is interested.
1.1       cgd      1191:  */
1.311     rmind    1192: static void
1.354     ozaki-r  1193: save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
1.1       cgd      1194: {
1.354     ozaki-r  1195:        struct ip_srcrt *isr;
                   1196:        struct m_tag *mtag;
1.1       cgd      1197:        unsigned olen;
                   1198:
                   1199:        olen = option[IPOPT_OLEN];
1.354     ozaki-r  1200:        if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes))
                   1201:                return;
                   1202:
                   1203:        mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT);
                   1204:        if (mtag == NULL)
1.1       cgd      1205:                return;
1.354     ozaki-r  1206:        isr = (struct ip_srcrt *)(mtag + 1);
                   1207:
                   1208:        memcpy(isr->isr_hdr, option, olen);
                   1209:        isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
                   1210:        isr->isr_dst = dst;
                   1211:        m_tag_prepend(m, mtag);
1.1       cgd      1212: }
                   1213:
                   1214: /*
                   1215:  * Retrieve incoming source route for use in replies,
                   1216:  * in the same form used by setsockopt.
                   1217:  * The first hop is placed before the options, will be removed later.
                   1218:  */
                   1219: struct mbuf *
1.354     ozaki-r  1220: ip_srcroute(struct mbuf *m0)
1.1       cgd      1221: {
1.109     augustss 1222:        struct in_addr *p, *q;
                   1223:        struct mbuf *m;
1.354     ozaki-r  1224:        struct ip_srcrt *isr;
                   1225:        struct m_tag *mtag;
                   1226:
                   1227:        mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE, NULL);
                   1228:        if (mtag == NULL)
                   1229:                return NULL;
                   1230:        isr = (struct ip_srcrt *)(mtag + 1);
1.1       cgd      1231:
1.354     ozaki-r  1232:        if (isr->isr_nhops == 0)
1.237     dyoung   1233:                return NULL;
1.354     ozaki-r  1234:
1.1       cgd      1235:        m = m_get(M_DONTWAIT, MT_SOOPTS);
1.354     ozaki-r  1236:        if (m == NULL)
1.237     dyoung   1237:                return NULL;
1.1       cgd      1238:
1.164     matt     1239:        MCLAIM(m, &inetdomain.dom_mowner);
1.354     ozaki-r  1240: #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
1.1       cgd      1241:
1.354     ozaki-r  1242:        /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */
                   1243:        m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ;
1.1       cgd      1244:
                   1245:        /*
                   1246:         * First save first hop for return route
                   1247:         */
1.354     ozaki-r  1248:        p = &(isr->isr_routes[isr->isr_nhops - 1]);
1.1       cgd      1249:        *(mtod(m, struct in_addr *)) = *p--;
                   1250:
                   1251:        /*
                   1252:         * Copy option fields and padding (nop) to mbuf.
                   1253:         */
1.354     ozaki-r  1254:        isr->isr_nop = IPOPT_NOP;
                   1255:        isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF;
                   1256:        memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop,
1.244     christos 1257:            OPTSIZ);
                   1258:        q = (struct in_addr *)(mtod(m, char *) +
1.1       cgd      1259:            sizeof(struct in_addr) + OPTSIZ);
                   1260: #undef OPTSIZ
                   1261:        /*
                   1262:         * Record return path as an IP source route,
                   1263:         * reversing the path (pointers are now aligned).
                   1264:         */
1.354     ozaki-r  1265:        while (p >= isr->isr_routes) {
1.1       cgd      1266:                *q++ = *p--;
                   1267:        }
                   1268:        /*
                   1269:         * Last hop goes to final destination.
                   1270:         */
1.354     ozaki-r  1271:        *q = isr->isr_dst;
                   1272:        m_tag_delete(m0, mtag);
                   1273:        return m;
1.1       cgd      1274: }
                   1275:
1.139     matt     1276: const int inetctlerrmap[PRC_NCMDS] = {
1.256     yamt     1277:        [PRC_MSGSIZE] = EMSGSIZE,
                   1278:        [PRC_HOSTDEAD] = EHOSTDOWN,
                   1279:        [PRC_HOSTUNREACH] = EHOSTUNREACH,
                   1280:        [PRC_UNREACH_NET] = EHOSTUNREACH,
                   1281:        [PRC_UNREACH_HOST] = EHOSTUNREACH,
                   1282:        [PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
                   1283:        [PRC_UNREACH_PORT] = ECONNREFUSED,
                   1284:        [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
                   1285:        [PRC_PARAMPROB] = ENOPROTOOPT,
1.1       cgd      1286: };
                   1287:
1.295     dyoung   1288: void
                   1289: ip_fasttimo(void)
                   1290: {
                   1291:        if (ip_drainwanted) {
                   1292:                ip_drain();
                   1293:                ip_drainwanted = 0;
                   1294:        }
                   1295: }
                   1296:
                   1297: void
                   1298: ip_drainstub(void)
                   1299: {
                   1300:        ip_drainwanted = 1;
                   1301: }
                   1302:
1.1       cgd      1303: /*
                   1304:  * Forward a packet.  If some error occurs return the sender
                   1305:  * an icmp packet.  Note we can't always generate a meaningful
                   1306:  * icmp message because icmp doesn't have a large enough repertoire
                   1307:  * of codes and types.
                   1308:  *
                   1309:  * If not forwarding, just drop the packet.  This could be confusing
                   1310:  * if ipforwarding was zero but some routing protocol was advancing
                   1311:  * us as a gateway to somewhere.  However, we must let the routing
                   1312:  * protocol deal with that.
                   1313:  *
                   1314:  * The srcrt parameter indicates whether the packet is being forwarded
                   1315:  * via a source route.
                   1316:  */
1.313     rmind    1317: static void
1.329     ozaki-r  1318: ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
1.1       cgd      1319: {
1.109     augustss 1320:        struct ip *ip = mtod(m, struct ip *);
                   1321:        struct rtentry *rt;
1.220     christos 1322:        int error, type = 0, code = 0, destmtu = 0;
1.1       cgd      1323:        struct mbuf *mcopy;
1.13      mycroft  1324:        n_long dest;
1.249     dyoung   1325:        union {
                   1326:                struct sockaddr         dst;
                   1327:                struct sockaddr_in      dst4;
                   1328:        } u;
1.320     ozaki-r  1329:        uint64_t *ips;
1.340     ozaki-r  1330:        struct route *ro;
1.164     matt     1331:
1.318     rmind    1332:        KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
                   1333:            "interrupt handler; synchronization assumptions violated");
                   1334:
1.164     matt     1335:        /*
                   1336:         * We are now in the output path.
                   1337:         */
                   1338:        MCLAIM(m, &ip_tx_mowner);
1.135     thorpej  1339:
                   1340:        /*
                   1341:         * Clear any in-bound checksum flags for this packet.
                   1342:         */
                   1343:        m->m_pkthdr.csum_flags = 0;
1.1       cgd      1344:
1.13      mycroft  1345:        dest = 0;
1.93      sommerfe 1346:        if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
1.266     thorpej  1347:                IP_STATINC(IP_STAT_CANTFORWARD);
1.1       cgd      1348:                m_freem(m);
                   1349:                return;
                   1350:        }
1.318     rmind    1351:
1.1       cgd      1352:        if (ip->ip_ttl <= IPTTLDEC) {
1.13      mycroft  1353:                icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
1.1       cgd      1354:                return;
                   1355:        }
                   1356:
1.249     dyoung   1357:        sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
1.318     rmind    1358:
1.340     ozaki-r  1359:        ro = percpu_getref(ipforward_rt_percpu);
1.345     ozaki-r  1360:        rt = rtcache_lookup(ro, &u.dst);
                   1361:        if (rt == NULL) {
1.340     ozaki-r  1362:                percpu_putref(ipforward_rt_percpu);
1.249     dyoung   1363:                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
                   1364:                return;
1.1       cgd      1365:        }
                   1366:
                   1367:        /*
1.34      mycroft  1368:         * Save at most 68 bytes of the packet in case
1.1       cgd      1369:         * we need to generate an ICMP message to the src.
1.119     itojun   1370:         * Pullup to avoid sharing mbuf cluster between m and mcopy.
1.1       cgd      1371:         */
1.155     itojun   1372:        mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
1.119     itojun   1373:        if (mcopy)
                   1374:                mcopy = m_pullup(mcopy, ip->ip_hl << 2);
1.1       cgd      1375:
1.221     christos 1376:        ip->ip_ttl -= IPTTLDEC;
                   1377:
1.1       cgd      1378:        /*
                   1379:         * If forwarding packet using same interface that it came in on,
                   1380:         * perhaps should send a redirect to sender to shortcut a hop.
                   1381:         * Only send redirect if source is sending directly to us,
                   1382:         * and if packet was not source routed (or has any options).
                   1383:         * Also, don't send redirect if forwarding using a default route
                   1384:         * or a route modified by a redirect.
                   1385:         */
1.329     ozaki-r  1386:        if (rt->rt_ifp == rcvif &&
1.1       cgd      1387:            (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
1.250     dyoung   1388:            !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
1.1       cgd      1389:            ipsendredirects && !srcrt) {
1.19      mycroft  1390:                if (rt->rt_ifa &&
                   1391:                    (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
                   1392:                    ifatoia(rt->rt_ifa)->ia_subnet) {
1.77      thorpej  1393:                        if (rt->rt_flags & RTF_GATEWAY)
                   1394:                                dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
                   1395:                        else
                   1396:                                dest = ip->ip_dst.s_addr;
                   1397:                        /*
                   1398:                         * Router requirements says to only send host
                   1399:                         * redirects.
                   1400:                         */
                   1401:                        type = ICMP_REDIRECT;
                   1402:                        code = ICMP_REDIRECT_HOST;
1.1       cgd      1403:                }
                   1404:        }
1.345     ozaki-r  1405:        rtcache_unref(rt, ro);
1.1       cgd      1406:
1.340     ozaki-r  1407:        error = ip_output(m, NULL, ro,
1.173     jonathan 1408:            (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
1.296     plunky   1409:            NULL, NULL);
1.173     jonathan 1410:
1.320     ozaki-r  1411:        if (error) {
1.266     thorpej  1412:                IP_STATINC(IP_STAT_CANTFORWARD);
1.320     ozaki-r  1413:                goto error;
                   1414:        }
                   1415:
                   1416:        ips = IP_STAT_GETREF();
                   1417:        ips[IP_STAT_FORWARD]++;
                   1418:
                   1419:        if (type) {
                   1420:                ips[IP_STAT_REDIRECTSENT]++;
                   1421:                IP_STAT_PUTREF();
                   1422:                goto redirect;
                   1423:        }
                   1424:
                   1425:        IP_STAT_PUTREF();
                   1426:        if (mcopy) {
1.63      matt     1427: #ifdef GATEWAY
1.320     ozaki-r  1428:                if (mcopy->m_flags & M_CANFASTFWD)
1.340     ozaki-r  1429:                        ipflow_create(ro, mcopy);
1.63      matt     1430: #endif
1.320     ozaki-r  1431:                m_freem(mcopy);
1.1       cgd      1432:        }
1.320     ozaki-r  1433:
1.340     ozaki-r  1434:        percpu_putref(ipforward_rt_percpu);
1.320     ozaki-r  1435:        return;
                   1436:
                   1437: redirect:
                   1438: error:
1.318     rmind    1439:        if (mcopy == NULL) {
1.340     ozaki-r  1440:                percpu_putref(ipforward_rt_percpu);
1.1       cgd      1441:                return;
1.318     rmind    1442:        }
1.13      mycroft  1443:
1.1       cgd      1444:        switch (error) {
                   1445:
                   1446:        case 0:                         /* forwarded, but need redirect */
                   1447:                /* type, code set above */
                   1448:                break;
                   1449:
                   1450:        case ENETUNREACH:               /* shouldn't happen, checked above */
                   1451:        case EHOSTUNREACH:
                   1452:        case ENETDOWN:
                   1453:        case EHOSTDOWN:
                   1454:        default:
                   1455:                type = ICMP_UNREACH;
                   1456:                code = ICMP_UNREACH_HOST;
                   1457:                break;
                   1458:
                   1459:        case EMSGSIZE:
                   1460:                type = ICMP_UNREACH;
                   1461:                code = ICMP_UNREACH_NEEDFRAG;
1.263     cube     1462:
1.345     ozaki-r  1463:                if ((rt = rtcache_validate(ro)) != NULL) {
1.274     seanb    1464:                        destmtu = rt->rt_ifp->if_mtu;
1.345     ozaki-r  1465:                        rtcache_unref(rt, ro);
                   1466:                }
1.305     rmind    1467: #ifdef IPSEC
1.317     christos 1468:                if (ipsec_used)
                   1469:                        (void)ipsec4_forward(mcopy, &destmtu);
1.305     rmind    1470: #endif
1.266     thorpej  1471:                IP_STATINC(IP_STAT_CANTFRAG);
1.1       cgd      1472:                break;
                   1473:
                   1474:        case ENOBUFS:
1.143     itojun   1475:                /*
1.311     rmind    1476:                 * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
                   1477:                 * Requirements for IP Version 4 Routers.  Source quench can
1.373     maxv     1478:                 * be a big problem under DoS attacks or if the underlying
1.311     rmind    1479:                 * interface is rate-limited.
1.143     itojun   1480:                 */
                   1481:                if (mcopy)
                   1482:                        m_freem(mcopy);
1.340     ozaki-r  1483:                percpu_putref(ipforward_rt_percpu);
1.143     itojun   1484:                return;
1.1       cgd      1485:        }
1.220     christos 1486:        icmp_error(mcopy, type, code, dest, destmtu);
1.340     ozaki-r  1487:        percpu_putref(ipforward_rt_percpu);
1.44      thorpej  1488: }
                   1489:
                   1490: void
1.211     perry    1491: ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
                   1492:     struct mbuf *m)
1.44      thorpej  1493: {
1.311     rmind    1494:        struct socket *so = inp->inp_socket;
                   1495:        int inpflags = inp->inp_flags;
1.330     ozaki-r  1496:
1.356     christos 1497:        if (SOOPT_TIMESTAMP(so->so_options))
                   1498:                mp = sbsavetimestamp(so->so_options, m, mp);
                   1499:
1.311     rmind    1500:        if (inpflags & INP_RECVDSTADDR) {
1.357     christos 1501:                *mp = sbcreatecontrol(&ip->ip_dst,
1.44      thorpej  1502:                    sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
                   1503:                if (*mp)
                   1504:                        mp = &(*mp)->m_next;
                   1505:        }
1.358     christos 1506:
                   1507:        if (inpflags & INP_RECVTTL) {
                   1508:                *mp = sbcreatecontrol(&ip->ip_ttl,
                   1509:                    sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
                   1510:                if (*mp)
                   1511:                        mp = &(*mp)->m_next;
                   1512:        }
                   1513:
                   1514:        struct psref psref;
                   1515:        ifnet_t *ifp = m_get_rcvif_psref(m, &psref);
                   1516:        if (__predict_false(ifp == NULL)) {
                   1517: #ifdef DIAGNOSTIC
                   1518:                printf("%s: missing receive interface\n", __func__);
                   1519: #endif
                   1520:                return; /* XXX should report error? */
                   1521:        }
                   1522:
1.311     rmind    1523:        if (inpflags & INP_RECVPKTINFO) {
1.306     christos 1524:                struct in_pktinfo ipi;
1.307     christos 1525:                ipi.ipi_addr = ip->ip_dst;
1.314     rmind    1526:                ipi.ipi_ifindex = ifp->if_index;
1.357     christos 1527:                *mp = sbcreatecontrol(&ipi,
1.306     christos 1528:                    sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
                   1529:                if (*mp)
                   1530:                        mp = &(*mp)->m_next;
                   1531:        }
1.311     rmind    1532:        if (inpflags & INP_RECVIF) {
1.44      thorpej  1533:                struct sockaddr_dl sdl;
                   1534:
1.337     ozaki-r  1535:                sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
                   1536:                    NULL, 0);
1.251     dyoung   1537:                *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
1.44      thorpej  1538:                if (*mp)
                   1539:                        mp = &(*mp)->m_next;
                   1540:        }
1.329     ozaki-r  1541:        m_put_rcvif_psref(ifp, &psref);
1.13      mycroft  1542: }
                   1543:
1.189     atatat   1544: /*
1.228     elad     1545:  * sysctl helper routine for net.inet.ip.forwsrcrt.
                   1546:  */
                   1547: static int
                   1548: sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
                   1549: {
                   1550:        int error, tmp;
                   1551:        struct sysctlnode node;
                   1552:
                   1553:        node = *rnode;
                   1554:        tmp = ip_forwsrcrt;
                   1555:        node.sysctl_data = &tmp;
                   1556:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1557:        if (error || newp == NULL)
                   1558:                return (error);
                   1559:
1.280     elad     1560:        error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
                   1561:            0, NULL, NULL, NULL);
                   1562:        if (error)
                   1563:                return (error);
1.228     elad     1564:
                   1565:        ip_forwsrcrt = tmp;
                   1566:
                   1567:        return (0);
                   1568: }
                   1569:
                   1570: /*
1.189     atatat   1571:  * sysctl helper routine for net.inet.ip.mtudisctimeout.  checks the
                   1572:  * range of the new value and tweaks timers if it changes.
                   1573:  */
                   1574: static int
                   1575: sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
1.13      mycroft  1576: {
1.189     atatat   1577:        int error, tmp;
                   1578:        struct sysctlnode node;
                   1579:
1.350     ozaki-r  1580:        icmp_mtudisc_lock();
                   1581:
1.189     atatat   1582:        node = *rnode;
                   1583:        tmp = ip_mtudisc_timeout;
                   1584:        node.sysctl_data = &tmp;
                   1585:        error = sysctl_lookup(SYSCTLFN_CALL(&node));
                   1586:        if (error || newp == NULL)
1.350     ozaki-r  1587:                goto out;
                   1588:        if (tmp < 0) {
                   1589:                error = EINVAL;
                   1590:                goto out;
                   1591:        }
1.273     matt     1592:
1.189     atatat   1593:        ip_mtudisc_timeout = tmp;
                   1594:        rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
1.350     ozaki-r  1595:        error = 0;
                   1596: out:
                   1597:        icmp_mtudisc_unlock();
1.351     ozaki-r  1598:        return error;
1.189     atatat   1599: }
1.54      lukem    1600:
1.266     thorpej  1601: static int
                   1602: sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
                   1603: {
                   1604:
1.271     thorpej  1605:        return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
1.266     thorpej  1606: }
1.131     itojun   1607:
1.284     pooka    1608: static void
                   1609: sysctl_net_inet_ip_setup(struct sysctllog **clog)
1.189     atatat   1610: {
1.197     atatat   1611:        sysctl_createv(clog, 0, NULL, NULL,
                   1612:                       CTLFLAG_PERMANENT,
1.203     atatat   1613:                       CTLTYPE_NODE, "inet",
                   1614:                       SYSCTL_DESCR("PF_INET related settings"),
1.189     atatat   1615:                       NULL, 0, NULL, 0,
                   1616:                       CTL_NET, PF_INET, CTL_EOL);
1.197     atatat   1617:        sysctl_createv(clog, 0, NULL, NULL,
                   1618:                       CTLFLAG_PERMANENT,
1.203     atatat   1619:                       CTLTYPE_NODE, "ip",
                   1620:                       SYSCTL_DESCR("IPv4 related settings"),
1.189     atatat   1621:                       NULL, 0, NULL, 0,
                   1622:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
1.212     perry    1623:
1.197     atatat   1624:        sysctl_createv(clog, 0, NULL, NULL,
                   1625:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1626:                       CTLTYPE_INT, "forwarding",
                   1627:                       SYSCTL_DESCR("Enable forwarding of INET datagrams"),
1.189     atatat   1628:                       NULL, 0, &ipforwarding, 0,
                   1629:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1630:                       IPCTL_FORWARDING, CTL_EOL);
1.197     atatat   1631:        sysctl_createv(clog, 0, NULL, NULL,
                   1632:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1633:                       CTLTYPE_INT, "redirect",
                   1634:                       SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
1.189     atatat   1635:                       NULL, 0, &ipsendredirects, 0,
                   1636:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1637:                       IPCTL_SENDREDIRECTS, CTL_EOL);
1.197     atatat   1638:        sysctl_createv(clog, 0, NULL, NULL,
                   1639:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1640:                       CTLTYPE_INT, "ttl",
                   1641:                       SYSCTL_DESCR("Default TTL for an INET datagram"),
1.189     atatat   1642:                       NULL, 0, &ip_defttl, 0,
                   1643:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1644:                       IPCTL_DEFTTL, CTL_EOL);
1.197     atatat   1645:        sysctl_createv(clog, 0, NULL, NULL,
1.228     elad     1646:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1647:                       CTLTYPE_INT, "forwsrcrt",
                   1648:                       SYSCTL_DESCR("Enable forwarding of source-routed "
                   1649:                                    "datagrams"),
1.228     elad     1650:                       sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
1.189     atatat   1651:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1652:                       IPCTL_FORWSRCRT, CTL_EOL);
1.197     atatat   1653:        sysctl_createv(clog, 0, NULL, NULL,
                   1654:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1655:                       CTLTYPE_INT, "directed-broadcast",
                   1656:                       SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
1.189     atatat   1657:                       NULL, 0, &ip_directedbcast, 0,
                   1658:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1659:                       IPCTL_DIRECTEDBCAST, CTL_EOL);
1.197     atatat   1660:        sysctl_createv(clog, 0, NULL, NULL,
                   1661:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1662:                       CTLTYPE_INT, "allowsrcrt",
                   1663:                       SYSCTL_DESCR("Accept source-routed datagrams"),
1.189     atatat   1664:                       NULL, 0, &ip_allowsrcrt, 0,
                   1665:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1666:                       IPCTL_ALLOWSRCRT, CTL_EOL);
1.311     rmind    1667:
1.197     atatat   1668:        sysctl_createv(clog, 0, NULL, NULL,
                   1669:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1670:                       CTLTYPE_INT, "mtudisc",
                   1671:                       SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
1.189     atatat   1672:                       NULL, 0, &ip_mtudisc, 0,
                   1673:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1674:                       IPCTL_MTUDISC, CTL_EOL);
1.197     atatat   1675:        sysctl_createv(clog, 0, NULL, NULL,
                   1676:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1677:                       CTLTYPE_INT, "anonportmin",
                   1678:                       SYSCTL_DESCR("Lowest ephemeral port number to assign"),
1.189     atatat   1679:                       sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
                   1680:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1681:                       IPCTL_ANONPORTMIN, CTL_EOL);
1.197     atatat   1682:        sysctl_createv(clog, 0, NULL, NULL,
                   1683:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1684:                       CTLTYPE_INT, "anonportmax",
                   1685:                       SYSCTL_DESCR("Highest ephemeral port number to assign"),
1.189     atatat   1686:                       sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
                   1687:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1688:                       IPCTL_ANONPORTMAX, CTL_EOL);
1.197     atatat   1689:        sysctl_createv(clog, 0, NULL, NULL,
                   1690:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1691:                       CTLTYPE_INT, "mtudisctimeout",
                   1692:                       SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
1.300     dsl      1693:                       sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
1.189     atatat   1694:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1695:                       IPCTL_MTUDISCTIMEOUT, CTL_EOL);
                   1696: #ifndef IPNOPRIVPORTS
1.197     atatat   1697:        sysctl_createv(clog, 0, NULL, NULL,
                   1698:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1699:                       CTLTYPE_INT, "lowportmin",
                   1700:                       SYSCTL_DESCR("Lowest privileged ephemeral port number "
                   1701:                                    "to assign"),
1.189     atatat   1702:                       sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
                   1703:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1704:                       IPCTL_LOWPORTMIN, CTL_EOL);
1.197     atatat   1705:        sysctl_createv(clog, 0, NULL, NULL,
                   1706:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1707:                       CTLTYPE_INT, "lowportmax",
                   1708:                       SYSCTL_DESCR("Highest privileged ephemeral port number "
                   1709:                                    "to assign"),
1.189     atatat   1710:                       sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
                   1711:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1712:                       IPCTL_LOWPORTMAX, CTL_EOL);
                   1713: #endif /* IPNOPRIVPORTS */
                   1714: #if NGRE > 0
1.197     atatat   1715:        sysctl_createv(clog, 0, NULL, NULL,
                   1716:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1717:                       CTLTYPE_INT, "grettl",
                   1718:                       SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
1.189     atatat   1719:                       NULL, 0, &ip_gre_ttl, 0,
                   1720:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1721:                       IPCTL_GRE_TTL, CTL_EOL);
                   1722: #endif /* NGRE */
1.197     atatat   1723:        sysctl_createv(clog, 0, NULL, NULL,
                   1724:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1725:                       CTLTYPE_INT, "checkinterface",
                   1726:                       SYSCTL_DESCR("Enable receive side of Strong ES model "
                   1727:                                    "from RFC1122"),
1.189     atatat   1728:                       NULL, 0, &ip_checkinterface, 0,
                   1729:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1730:                       IPCTL_CHECKINTERFACE, CTL_EOL);
1.197     atatat   1731:        sysctl_createv(clog, 0, NULL, NULL,
                   1732:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
1.203     atatat   1733:                       CTLTYPE_INT, "random_id",
                   1734:                       SYSCTL_DESCR("Assign random ip_id values"),
1.189     atatat   1735:                       NULL, 0, &ip_do_randomid, 0,
                   1736:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1737:                       IPCTL_RANDOMID, CTL_EOL);
1.206     thorpej  1738:        sysctl_createv(clog, 0, NULL, NULL,
                   1739:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1740:                       CTLTYPE_INT, "do_loopback_cksum",
                   1741:                       SYSCTL_DESCR("Perform IP checksum on loopback"),
                   1742:                       NULL, 0, &ip_do_loopback_cksum, 0,
                   1743:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1744:                       IPCTL_LOOPBACKCKSUM, CTL_EOL);
1.219     elad     1745:        sysctl_createv(clog, 0, NULL, NULL,
                   1746:                       CTLFLAG_PERMANENT,
                   1747:                       CTLTYPE_STRUCT, "stats",
                   1748:                       SYSCTL_DESCR("IP statistics"),
1.266     thorpej  1749:                       sysctl_net_inet_ip_stats, 0, NULL, 0,
1.219     elad     1750:                       CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
                   1751:                       CTL_EOL);
1.322     joerg    1752: #if NARP
1.321     roy      1753:        sysctl_createv(clog, 0, NULL, NULL,
                   1754:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1755:                       CTLTYPE_INT, "dad_count",
                   1756:                       SYSCTL_DESCR("Number of Duplicate Address Detection "
                   1757:                                    "probes to send"),
                   1758:                       NULL, 0, &ip_dad_count, 0,
                   1759:                       CTL_NET, PF_INET, IPPROTO_IP,
                   1760:                       IPCTL_DAD_COUNT, CTL_EOL);
1.322     joerg    1761: #endif
1.301     christos 1762:
                   1763:        /* anonportalgo RFC6056 subtree */
1.302     christos 1764:        const struct sysctlnode *portalgo_node;
                   1765:        sysctl_createv(clog, 0, NULL, &portalgo_node,
1.301     christos 1766:                       CTLFLAG_PERMANENT,
                   1767:                       CTLTYPE_NODE, "anonportalgo",
                   1768:                       SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
                   1769:                       NULL, 0, NULL, 0,
                   1770:                       CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
1.302     christos 1771:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1772:                       CTLFLAG_PERMANENT,
                   1773:                       CTLTYPE_STRING, "available",
                   1774:                       SYSCTL_DESCR("available algorithms"),
1.302     christos 1775:                       sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
1.301     christos 1776:                       CTL_CREATE, CTL_EOL);
1.302     christos 1777:        sysctl_createv(clog, 0, &portalgo_node, NULL,
1.301     christos 1778:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1779:                       CTLTYPE_STRING, "selected",
                   1780:                       SYSCTL_DESCR("selected algorithm"),
1.303     christos 1781:                       sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
                   1782:                       CTL_CREATE, CTL_EOL);
                   1783:        sysctl_createv(clog, 0, &portalgo_node, NULL,
                   1784:                       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                   1785:                       CTLTYPE_STRUCT, "reserve",
                   1786:                       SYSCTL_DESCR("bitmap of reserved ports"),
                   1787:                       sysctl_portalgo_reserve4, 0, NULL, 0,
1.301     christos 1788:                       CTL_CREATE, CTL_EOL);
1.1       cgd      1789: }
1.266     thorpej  1790:
                   1791: void
                   1792: ip_statinc(u_int stat)
                   1793: {
                   1794:
                   1795:        KASSERT(stat < IP_NSTATS);
                   1796:        IP_STATINC(stat);
                   1797: }

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